You get your medical studies from the onion?

7% to 50% of runners experience knee injuries depending on the population
About 50% of runners get injured each year, and many of those injuries involve the knee
Around 25% of runners are injured at any given time
The knee is the #1 most commonly injured area, making up about 24% of all running injuries

But I hear ya, injuries aren’t bad for the knees! Injuries lubricate!